JP2003226025A - Inkjet recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably form a high quality image by preventing a bubble from being conveyed into a recording head in a simple structure. <P>SOLUTION: This inkjet recorder comprises a recording head for performing recording by ejecting ink, an ink tank for reserving a large quantity of ink, and a sub-tank equipped with a ventilating hole for temporarily reserving the ink. The ink tank is coupled to the sub-tank and the sub-tank is coupled to the recording head. A means for isolating the ink from the open air is provided in the sub-tank. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer, FA
X, ink supply used for image forming devices such as copying machines
More specifically, the present invention relates to an inkjet recording apparatus having a recovery mechanism and the ink, and more specifically to an inkjet recording apparatus that uses deaeration ink and the ink.

[0002]

2. Description of the Related Art A recording device having functions of a printer, a fax machine, a copying machine, a multifunction device including a computer, a word processor, etc., and a recording device used as an output device of a workstation are formed of paper or plastic based on image information. The image is recorded on a recording sheet such as a thin plate (for example, used for OHP or the like).
Such a recording apparatus may be an inkjet type, a wire dot type, a heat sensitive type, or a recording type, depending on the recording method of the recording means used.
It can be classified into a thermal transfer type or a laser beam type.

Among these methods, an ink jet type recording apparatus (ink jet recording apparatus) is one which performs recording by ejecting ink from a recording head as a recording means onto a recording sheet such as paper. It is easy to make compact, and high-definition images can be recorded at high speed. In addition, plain paper can be recorded without special processing, running cost is low, and since it is a non-impact system, it produces less noise, and color images are recorded using multicolor inks. It has the advantage of being easy.

FIG. 2 is a schematic configuration diagram showing an ink path in a general ink jet recording apparatus. As shown in FIG. 2, a general inkjet recording apparatus includes a recording head 1 as a recording unit that ejects ink to perform recording,
An ink tank 2 such as an ink cartridge that stores a large amount of ink, a sub-tank 3 that temporarily stores ink and has an air communication port 8, and ink that is ejected from the recording head 1 for recovery processing. For cap 4
Such as a first pump 5 for supplying ink to the recording head 1, a second pump 6 for supplying ink from the ink tank 2 to the sub tank 3, and a suction pump for collecting ink from the cap 4. It has an ink path formed with the third pump 7.

In the ink path of such a general ink jet recording apparatus, the ink stored in the ink tank 2 is supplied to a predetermined liquid level in the sub tank 3 and stored therein by means such as the second pump 6. Ink can be supplied to the recording head 1. At the time of printing, that is, at the time of recording, ink is ejected from the recording head 1 onto a recording sheet such as paper, and the ink in the sub tank 3 is consumed. At this time, when the remaining ink amount detection sensor installed in the sub tank 3 detects the decrease in the liquid level, the above-described ink supply mode is resumed and the liquid level is returned to a predetermined liquid level.

When there is no means for opening the atmosphere in the sub tank,
Since there is no replenishment of air to the ink sub-tank, the negative pressure in the ink supply path increases when the print head is driven, and air bubbles escape when ink is supplied from the ink tank or ink is circulated. Since there is no means for removing the bubbles, air bubbles are mixed into the recording head, which causes ejection failure. For this reason, generally, an atmosphere opening means is provided in the sub tank.

In the structure of the ink path in such a conventional ink jet recording apparatus, the inside of the ink path is open to the atmosphere. However, in recent years, there has been an increasing demand for recording high-definition images at higher speeds than ever before,
As one of the methods for obtaining the stability of ink ejection during printing, deaerated ink may be used. By using such a degassed ink, it is possible to prevent the bubbles from being generated inadvertently in the ink, but since the configuration of the ink path in the above-described inkjet recording device is normally open to the atmosphere, There is a problem that the degassing degree of the ink decreases with time.

In order to solve these problems, Japanese Unexamined Patent Publication No. 2001-301191 discloses an ink cartridge having a second liquid other than the ink together with the ink in the ink containing chamber as a conventional means.

[0009]

When the ink discharged during cleaning or the like is collected from a cap or the like and reused, bubbles are generated in the ink while the ink is circulating through the route for reuse. There is a problem that the ink melts and the ink cannot be reused.

An object of the present invention is to have a simpler structure and to eliminate air bubbles generated when ink is supplied from the ink tank or when the ink is circulated in the sub tank while the ink in the sub tank is not in contact with the atmosphere. An object is to provide a possible inkjet recording device.

[0011]

In order to solve the above-mentioned problems, according to the present invention, a recording head for ejecting ink for recording, an ink tank for storing a large amount of ink, and an atmosphere communication port are provided. A sub tank for temporarily storing, the ink tank is connected to the sub tank,
Furthermore, the sub-tank is an inkjet recording device connected to the recording head, and the sub-tank is provided with means for cutting off ink from the atmosphere.

Further, the sub-tank is provided with a protective liquid for shutting off the ink and the atmosphere.

Further, the invention is characterized in that a cap for collecting ink ejected from the recording head is provided, and the cap is connected to a sub tank.

Further, an ink flow path from the recording head to the sub tank is provided, and ink is circulated between the recording head and the sub tank.

Further, the protective liquid is a liquid having a specific gravity lighter than that of the ink.

Further, the protective liquid is incompatible with the ink.

Further, the protective liquid is a non-volatile liquid.

The protective liquid is impermeable to gas.

Further, the ink is characterized in that a water-based ink is used.

Further, the ink is characterized by using an ink having a dissolved oxygen content of 40% or less.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION The ink jet recording apparatus of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing the construction of a sub tank in the above-mentioned first example of the ink jet recording apparatus of the present invention. In the sub tank 3, ink 9 and air phase 10
Is formed, and between the ink 9 and the air phase 10,
An incompatible protective liquid 11 that is non-volatile and has a lower specific gravity than the ink is provided, and the ink 9 and the air phase 10 are separated by the protective liquid 11. Further, an atmosphere opening means 8 is provided on the upper portion of the sub tank 3, and an ink supply port 13 for supplying ink to the recording head 1 is provided on the bottom surface.
An ink supply port 12 for receiving ink from an ink tank storing a large amount of ink is provided, and an electrode ink remaining amount detection sensor 17 is further provided.

As described above, since the protective liquid 11 is configured to separate the ink and the air phase in the sub tank 3, the air bubbles mixed in the sub tank 3 are kept in a state where the ink in the sub tank 3 is not brought into contact with the atmosphere. It is possible to remove it from the atmosphere communication port. Further, since the protective liquid 11 is separated by the difference in specific gravity from the ink, the protective liquid moves following the ink even when the ink vibrates due to movement of the head or the like, so that the air bubbles mixed in the sub tank 3 are removed and It retains the function of shielding from the atmosphere.

That is, according to the present invention, it is possible to prevent air bubbles from entering the recording head from the sub tank with a simple structure.

In the sub-tank of the present invention, the protective liquid for separating the ink from the air needs to be incompatible with the ink in the sub-tank. Therefore, even if the protective liquid is in a state where the ink in the sub-tank and the air phase are separated for a long period of time, the defective ejection of the ink in the recording head caused by the mixing of the protective liquid with the ink without mixing with the ink, The print quality is less likely to deteriorate. The present invention can be applied when the solubility of the protective liquid in the ink is 0.5% by weight or less at room temperature (25 ° C.).

Furthermore, this protective liquid is non-volatile.
Therefore, this protective liquid does not evaporate during storage in the ink tank, and the protected state does not change. As a result, the ink and the air phase in the sub tank can be separated over a long period of time. The vapor pressure of the protective liquid is room temperature (25 ° C)
The present invention is applied to the case of about 1.33 kPa (10.0 mmHg) or less, particularly preferably about 133 Pa.
It is better to be (1.0 mmHg) or less. Further, it is particularly effective when it is preferably about 13.3 Pa (0.1 mmHg) or less.

The protective liquid may be used in one layer alone or in two or more layers. Further, when the sub-tank is divided into two or more, the means for blocking the ink by the protective liquid and the atmosphere may be provided only in the portion open to the atmosphere.

Further, it is preferable that the protective liquid should allow the bubbles floating above the ink in the sub tank to escape to the air phase without leaving inside the ink. Therefore, the present invention is applied when the viscosity of the protective liquid is 100 mPa · s or less, and is particularly effective when the viscosity is 50 mPa · s or less.

Further, the protective liquid in the ink tank is impermeable to air phase gas. Therefore,
Even when the protective liquid separates the ink and the air phase in the ink tank for a long period of time, the dissolved gas amount of the ink can be kept low. The thickness of the protective liquid is
The present invention can be applied when the thickness is 0.1 mm or more.

These may be used alone or in combination of two or more, and may not be uniformly mixed. Further, a plurality of materials may be mixed to adjust the viscosity and surface tension to a preferable range before use.

Further, it is preferable that the protective liquid in the ink tank is in a state where the ink and the air phase are separated without any gap in the ink tank. From this point, the protective liquid preferably has a small contact angle with the member in the ink tank, and specifically, the present invention can be applied when the contact angle is 120 ° or less.

When a water-based ink is used, an organic solvent or oil which is liquid at room temperature can be used as the protective liquid. More specifically, octane, nonane, decane, tetradecane, dodecane, oleic acid, linoleic acid, n-decanol, dimethylbutanol, dibutyl phthalate, dioctyl phthalate, bis-2-ethylhexyl phthalate, dibutyl maleate, malein. Organic solvent such as dioctyl acid and its isomers and derivatives, and further vegetable oil, mineral oil,
Oils such as silicone oil and fluorine oil are preferable. The present invention can be applied when this protective liquid is a liquid having a specific gravity lower than that of the ink. The specific gravity of the water-based ink is about 1.0 to 1.1 g / cm 3, and the specific gravity of these organic solvents and oils is about 0.6 to 1.
Since it is 0 g / cm 3, it is particularly effective.

The ink composition used is as follows:
Various materials are used without limitation. Generally used as a main material for colorants and solvents, as a binder, viscosity, surface tension, and pH.
It is constituted by adding a physical property adjusting agent such as, a fungicide, and the like. The colorant is a dye or a pigment, and the solvent is mainly water or a water-soluble organic solvent, but a non-aqueous solvent is also possible. In addition to the function as a solvent, these solvents may have an action such as an anti-drying agent (wetting agent), a penetrating agent (surface tension reducing agent), a viscosity, an evaporation rate controlling agent, etc.
Materials exhibiting surface tension, solubility, boiling point, evaporation rate, flash point, etc. are used.

In the ink jet recording apparatus,
The recording head is particularly formed in the case of inkjet recording in which a piezoelectric element is formed on a part of a pressure generating chamber communicating with a nozzle opening for ejecting an ink droplet via a vibration plate and the ink droplet is ejected by displacement of the piezoelectric element. It is valid.

Further, the present invention can be effectively applied to a full line type recording head having a length corresponding to the maximum width of a recording medium which can be recorded by the recording apparatus. Such a recording head may have a configuration that satisfies the length by a combination of a plurality of recording heads or a configuration as one recording head integrally formed.

In addition, among the serial type recording heads, the recording head fixed to the apparatus main body or mounted on the apparatus main body can be electrically connected to the apparatus main body or can supply ink from the apparatus main body. The present invention is also effective when a replaceable chip type recording head or a cartridge type recording head in which an ink tank is integrally provided in the recording head itself is used.

Further, as the constitution of the recording apparatus to which the present invention can be applied, various forms of ejection recovery means (including preliminary auxiliary means etc.) of the recording head may be used. Specifically, capping means for the recording head,
It may include a cleaning means such as a blade, a means for removing ink from the ink ejection port by pressurization or suction of the ink supply system, and a preliminary ejection means for performing ejection different from recording.

In addition, as a form of the ink jet recording apparatus applicable to the present invention, other than the one used as an image output terminal of information processing equipment such as a computer, a copying apparatus combined with a reader or the like, and a facsimile having a transmitting / receiving function. It may be a device or the like.

FIG. 3 shows a second example of a sectional view of a sub tank of an ink jet recording apparatus. The ink 9 and the air phase 10 are formed in the sub tank 3 of the ink jet recording apparatus, and the non-compatible protective liquid 11 which is nonvolatile and has a lower specific gravity than the ink is formed between the ink 9 and the air phase 10 inside the sub tank. Is provided, and the ink 9 and the air phase 10 are separated by the protective liquid 11. Atmosphere opening means is provided in the upper part of the sub tank, and an ink supply port 13 for supplying ink to the recording head 1 is provided on the bottom surface, and an ink for receiving ink from the ink tank 2 storing a large volume of ink. A supply port 12 is installed, and an ink recovery port 14 for recovering ink from the recording head 1 through the cap 4 is installed on the side surface of the sub tank.
Further, an electrode ink remaining amount detection sensor 17 is provided.

FIG. 4 shows an example of a schematic configuration diagram of an ink path of an ink jet recording apparatus using the sub tank shown in FIG. As shown in FIG. 4, a recording head 1 as a recording unit that ejects ink to perform recording, a replaceable ink tank 2 such as an ink cartridge that stores ink, an atmosphere communication port 8, and an ink. Is temporarily stored, a cap 4 for receiving ink ejected from the recording head 1 for recovery processing, a first pump 5 for supplying ink to the recording head 1, and a sub tank 3 from the ink tank 2. Pump 6 for supplying ink to the
And an ink path formed by a third pump 7 such as a suction pump for sucking and collecting ink from the cap 4.

FIG. 5 shows a third example of a sectional view of a sub tank in an ink jet recording apparatus. An ink 9 and an air phase 10 are formed in the sub tank 3 of the inkjet recording apparatus, and a non-volatile, incompatible protective liquid having a lighter specific gravity than the ink is formed between the ink 9 and the air phase 10 inside the ink tank. 11 is provided and is configured to separate the ink 9 and the air phase 10 by the protective liquid 11.
Atmosphere opening means 8 is provided on the upper part of the sub tank, and an ink supply port 13 for supplying ink to the recording head 1 is provided on the bottom surface and an ink tank 2 for storing a large amount of ink to receive ink. The ink supply port 12 is installed, and the recording head 1 to the cap 4 are provided on the side surface of the sub tank.
An ink recovery port 14 for recovering ink through the
An ink return port 15 for returning ink through the recording head 1 is provided, and the electrode ink remaining amount detection sensor 1 is further provided.
7 is provided.

FIG. 6 shows an example of a schematic configuration diagram of an ink path of an ink jet recording apparatus using the sub tank shown in FIG. A recording head 1 as a recording unit that ejects ink to perform recording, a replaceable ink tank 2 such as an ink cartridge that stores ink, an atmosphere communication port 8, and a sub tank 3 that temporarily stores ink. A cap 4 for receiving ink discharged from the recording head 1 for recovery processing, a first pump 5 for supplying ink to the recording head 1 and circulating ink in the recording head to the sub tank 3, It has an ink path formed by a second pump 6 for supplying ink from the tank 2 to the sub tank 3 and a third pump 7 such as a suction pump for sucking and collecting the ink from the cap 4. .

Next, the present invention will be specifically described with reference to examples, but the invention is not limited to the examples.

35 parts by weight of purified water, 60 parts by weight of glycerin (manufactured by Wako Pure Chemical Industries) and 5 parts by weight of ethylene glycol monoisobutyl ether (manufactured by Wako Pure Chemical Industries) are mixed,
Further, an aqueous pigment dispersion (CAB-O-JET200 manufactured by Cabot Specialty Chemicals, pigment content 19.5
(Wt%) was mixed so that the pigment concentration was constant. A total of 300 g of the composition was dispersed using a homogenizer (HG30 manufactured by Hitachi Koki) at a rotation speed of 2,000 rpm until a homogeneous mixture was obtained. The obtained mixture was filtered to remove impurities and the like and then degassed to obtain a homogeneous ink composition with a small amount of dissolved oxygen.

100 mL of the obtained ink was put in a sample bottle.
In addition, 5 mL of each organic solvent and oil, silicone oil (silicone manufactured by Shin-Etsu Chemical), DOP (bis-2-ethylhexyl phthalate manufactured by Wako Pure Chemical Industries), Dowanol (propylene glycol phenyl ether manufactured by Dow Chemical) as a protective liquid ( In this example, the thickness corresponds to 1 mm.) Air was passed through the sample obtained here through a tube for 5 minutes at a flow rate of 2 cm ³ / sec.
The foaming of the sample at this time was measured. As a comparative example, the same measurement was performed on a sample containing only ink.
The measurement results are shown in Table 1.

[0046]

[Table 1]

100 mL of the obtained ink was put in a sample bottle.
In addition, 5 mL of each organic solvent and oil, silicone oil (silicone manufactured by Shin-Etsu Chemical), DOP (bis-2-ethylhexyl phthalate manufactured by Wako Pure Chemical Industries), Dowanol (propylene glycol phenyl ether manufactured by Dow Chemical) as a protective liquid ( In this example, the thickness corresponds to 1 mm.) The change in the dissolved oxygen content of the sample obtained here was measured by DO METER (TOX-9 manufactured by Toko Kagaku Kenkyusho).
0i) was measured with a magnetic stirrer while gently stirring. As a comparative example, the same measurement was performed on a sample containing only ink. Table 2 shows the measurement results
Shown in.

Here, the degassing degree indicates how small the amount of gas contained in the ink is. Therefore, it should be defined by the amount of nitrogen and oxygen dissolved in the ink, but in the present invention, the amount of dissolved oxygen (DO value:
DO = Dissolve Oxygen) is substituted.
That is, it indicates that the smaller the DO value, the higher the degassing degree. The DO value is represented by the amount of oxygen dissolved in 1 liter of solute (mg / L), but the DO value fluctuates depending on the temperature, and therefore is represented by the degree of saturation (%).

[0049]

[Table 2]

For reference, the DO value of the non-degassed ink measured in the same manner is 56.2%.

From Table 2, the inks of Examples (Examples 1 to 1)
It was confirmed that in the case of 3), the degassed state was maintained as compared with Comparative Example 1.

Next, these samples were put in an ink tank, and a direct plate making machine (SJ02A manufactured by Hitachi Koki) was used.
The head part is extracted, fixed and used for printing. The maximum ink ejection frequency is 6 kHz and the paper feed speed is 10 inch.
As per sec, resolution 600 (× 600) dp
The dot omission after printing i for 10 minutes was evaluated.
The results are shown in Table 3. If air bubbles are present in the recording head, the pressure is not propagated to the ink from the actuator (not shown) for propagating the pressure, so that the ink is not ejected, that is, the printing dot is missing.

[0053]

[Table 3]

As shown in Table 3, missing dots are eliminated in the embodiment. That is, the result reflects the difference in the dissolved oxygen amount in Table 1 as it is. Further, when the protective liquid was used, missing dots of printed characters did not occur when the DO value was 40% or less, and missing dots occurred when it was 41% or more. Therefore,
The DO value must be 40% or less to obtain good printing.

In order to prevent careless generation of bubbles in the ink, the present invention can be applied when the amount of dissolved oxygen in the ink is 40% or less in the ink jet recording apparatus, and the amount of dissolved oxygen is particularly preferable. It is better to be 30% or less. More preferably, it is particularly effective when 20% or less of ink is used.

In the ink jet recording apparatus of the present invention, the ink is arranged so as to be covered with the protective liquid and separated from the air, even if the sub tank is provided with the atmosphere atmosphere opening means. For this reason, it is possible to remove the air bubbles mixed in the sub tank without contacting the ink in the sub tank with the atmosphere, non-ejection due to the inclusion of bubbles in the recording head, misrecognition of the liquid surface due to the bubbling of ink in the sub tank, It is possible to obtain an inkjet recording apparatus capable of preventing the evaporation of ink in the path and creating a stable recording state.

[0057]

In the ink jet recording apparatus according to the first aspect of the present invention, the nonvolatile is provided in the ink supply path between the ink tank and the ink jet head, particularly in the ink tank for storing the ink and the sub tank for temporarily storing the ink. Means for blocking the ink and the air by the protective liquid having a specific gravity lower than that of the volatile ink are provided. For this reason, it is possible to remove the air bubbles mixed in the sub tank without contacting the ink in the sub tank with the atmosphere, non-ejection due to the inclusion of bubbles in the recording head, misrecognition of the liquid surface due to the bubbling of ink in the sub tank, It is possible to prevent the evaporation of ink in the sub tank and the decrease in degassing degree.

As a result, it is possible to create a stable recording state with a simple structure, and to increase the pump flow rate, which is indispensable for increasing recovery efficiency, and also to use ink that easily causes bubbles, thus making it possible to use a recording medium. It is possible to obtain an ink jet recording apparatus that can expand the selection range of.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a sub tank in an inkjet recording apparatus that is a first example of the present invention.

FIG. 2 is a schematic diagram showing a configuration of an ink circulation path of a general inkjet recording apparatus.

FIG. 3 is a cross-sectional view of a sub tank in an inkjet recording apparatus that is a second example of the present invention.

FIG. 4 is a schematic diagram showing a configuration of an ink circulation path of an inkjet recording apparatus as an example of the present invention.

FIG. 5 is a cross-sectional view of a sub tank in an inkjet recording apparatus that is a third example of the present invention.

FIG. 6 is a schematic diagram showing a configuration of an ink circulation path of an ink jet recording apparatus which is another example of the present invention.

[Explanation of symbols]

1 is a recording head, 2 is an ink tank, 3 is a sub tank,
4 is a cap, 5 is a first pump, 6 is a second pump, 7 is a third pump, 8 is an atmosphere communication port, 9 is ink, 10 is an air phase, 11 is a protective liquid, 12 is an ink receiving port, 13 is Ink supply port, 14 ink recovery port, 15 ink return port,
Reference numeral 16 is a waste ink tank, and 17 is an electrode ink remaining amount detection sensor.

[Procedure amendment]

[Submission date] February 5, 2002 (2002.2.5)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0057

[Correction method] Change

[Correction content]

[0057]

Lee inkjet recording apparatus of the present invention exhibits, in the ink supply path between the ink tank and the ink jet head, particularly in the sub tank to the ink tank and temporarily stored storing ink, non-volatile ink Means for blocking the ink and the air by the protective liquid having a lower specific gravity than that is provided. For this reason, it is possible to remove the air bubbles mixed in the sub tank without contacting the ink in the sub tank with the atmosphere, non-ejection due to the inclusion of bubbles in the recording head, misrecognition of the liquid surface due to the bubbling of ink in the sub tank, It is possible to prevent the evaporation of ink in the sub tank and the decrease in degassing degree.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Akemi Ouchi             Hitachiko, 1060 Takeda, Hitachinaka City, Ibaraki Prefecture             Machine Co., Ltd. (72) Inventor Kunio Sato             Hitachiko, 1060 Takeda, Hitachinaka City, Ibaraki Prefecture             Machine Co., Ltd. (72) Inventor Hitoshi Kida             Hitachiko, 1060 Takeda, Hitachinaka City, Ibaraki Prefecture             Machine Co., Ltd. (72) Inventor Kunihiro Tamahashi             Hitachiko, 1060 Takeda, Hitachinaka City, Ibaraki Prefecture             Machine Co., Ltd. F-term (reference) 2C056 EA15 EA26 EB21 EB51 FC01                       JA03 JA13 KB37 KC16 KC18

Claims (10)

[Claims] 1. A recording head for ejecting ink for recording, an ink tank for storing a large amount of ink, an air communication port, and a sub tank for temporarily storing ink, the ink tank comprising: An inkjet recording apparatus connected to a sub-tank, the sub-tank being connected to the recording head, wherein the sub-tank is provided with means for cutting off ink from the atmosphere. 2. The ink jet recording apparatus according to claim 1, wherein a protective liquid that shuts off ink from the atmosphere is provided in the sub tank. 3. The ink jet recording apparatus according to claim 1, further comprising a cap for collecting ink ejected from the recording head, the cap being connected to a sub tank. 4. An ink flow path from the recording head to the sub-tank is provided, and ink is circulated between the recording head and the sub-tank.
The inkjet recording device described. 5. The ink jet recording apparatus according to claim 1, wherein the protective liquid is a liquid having a specific gravity lower than that of the ink. 6. The ink jet recording apparatus according to claim 1, wherein the protective liquid is incompatible with ink. 7. The ink jet recording apparatus according to claim 1, wherein the protective liquid is a non-volatile liquid. 8. The ink jet recording apparatus according to claim 1, wherein the protective liquid is impermeable to gas. 9. The ink jet recording apparatus according to claim 1, wherein the ink is a water-based ink. 10. The ink jet recording apparatus according to claim 1, wherein the ink is an ink having a dissolved oxygen content of 40% or less.